Magnetic recorder with friction drive device incorporatied within the magazine



Dec. 28, 1948. R. A. MARSEN 2,457,699

' MAGNETIC RECORDER WITH FRICTION DRIVE DEVICE INCORYORATED WITHIN THEMAGAZINE Filed larch 29, 1945 2 Sheets-Sheet 1 1948- R. A. MARSENMAGNETIC RECORDER WITH FRICTION DRIVE DEVICE INCORPORATED WITHIN THEMAGAZINE Filed March 29. 1945 2 Sheets-Sheet 2 MVENYUR Patented Dec. 28,1948 MAGNETIC RECORDER WITH FRICTION DRIVE DEVICE INCORPORATED WITH- INTHE MAGAZINE Richard A. Marsen, New York, N. Y., assignor, by mesneassignments, to Lear, Incorporated, Grand Rapids, Mich., a corporationof Illinois Application March 29, 1945, Serial No. 585,545

Claims.

This invention relates to magnetic recording systems incorporating anovel drive arrangement for reeling the wire or tape at a uniform speedthroughout the recording interval.

To secure the best results in magnetic recording systems of the typeemploying a linear magnetic recording medium such as a wire or tape, itis essential that the recording medium be moved at a substantiallyuniform rate past the translating head. Generally, the recording mediumis stored on a pair of reels, and wound up on one reel as it is unwoundfrom the other. Means are usually provided for driving the take on reelat a uniform rate throughout the recording antennae. However, since thediameter of the wire or tape coiled on the reel increases during therecording interval, its linear speed past the translating head likewiseincreases, resulting in non-uniformity of recording quality along thelength of the medium. For example in an hour of recording, such speeddifference may be more than fifty percent. Since the frequencycharacteristic of recording on a magnetic medium is generallyproportional to its speed of movement,

the advantages of constancy of such speed are important.

Various relatively complicated means have been devised to overcome thisdiillculty and provide uniform speed of the recording medium past thetranslating head. Generally, these have embodied one or more additionaldriving means engaging the recording medium between the reels or spools,and have therefore added to the expense, complexity, number of componentparts and weight of the driving mechanism. This has been particularly soin magnetic recording systems of the type in which the magnetic wire ortape is stored in a magazine which is detachably cooperative with atranslating unit containing driving mechanism for the recording medium,and electrical components for recording or reproducing.

It is among the objects of this invention to provide magnetic recordingsystems including simple novel drivin mechanism for moving the recordingmedium at a continuously uniform speed relative to the magnetictranslating head; to provide a novel magazine type magnetic recordingsystem including a simple, inexpensive magazine containing reels forinterchangeably receiving the magnetic recording medium for linearmovement with respect to a translating head; to provide such a magazinedetachably cooperative with a translating unit including frictiondriving means engaging the recording medium coiled on reels and atranslating head cooperative with the recording medium; to provide sucha magnetic recording system including simple latching means formaintaining the magazine in properly aligned relation with thetranslating unit; to provide such a system including means automaticallyoperable to take up slack in the magnetic recording medium as themagazine is engaged with the translating unit; and generally to providea simple, inexpensive, lightweight and efiicient magnetic recordingsystem.

These and other objects, advantages and novel features of the inventionwill be apparent from the following description and the accompanyingdrawings. In the drawings:

Fig. 1 is a perspective view of a translating unit and a magazineengaged therewith, according to the present invention.

Fig. 2 is a longitudinal sectional view through cooperating portions ofthe magazine and unit of Fig. 1.

Fig. 3 is a view on the line 3-3 of Fig. 2, illustrating the translatinghead and its spooling mechanism.

Fig. 4 is a transverse view, partly in section, of the magazine and unitshowing latching means for the magazine.

Fig. 5 is a perspective view of the magazine, on a reduced scale,showing one element of the latching means.

Fig. 6 is a view similar to Fig. 3 illustrating a slightly modified formof the driving mechanism.

Fig. 7 is a plan view of the driving mechanism in the translating unit.

Fig. 8 is an end elevation view of the mechanism shown in Fig. 7.

Fig. 9 is an end view of a modified form of translating head for usewith the invention.

Generally speaking, the present invention comprises a magnetic recordercontaining a pair of spaced reels interchangeably receiving a linearmagnetic recording medium. In the illustrated embodiment of theinvention the reels and recording medium are mounted in a detachablemagazine engageable' with the recorder unit. However, the inventiondrive may be used in a non-magazine arrangement. The magazine isdetachably cooperative with a translating unit that contains drivingmechanism for the recording medium, a translating head cooperable withthe recording medium, and electronic components for recording andreproducing intelligence on or from the recording medium. Simplelatching means are provided which are automatically r operative uponengagement of the magazine with the translating unit to latch the samein properly aligned relation with the translating unit.

Spooling mechanism is provided in association -with the translating headfor level winding of provision of driving means which frictionallyengage the magnetic recording medium, such as wire or tape, coiled onthe reels in the magazine. The driving mechanism directly engages therecording medium coiled on the reels, and is operated at a uniform speedby suitable drive means. Compensating change occurs in the drivingengagement whereby uniform traversing speed of the recording medium withrespect to the translating head throughout its length is accomplished.

Referring to Fig. 1 of the drawings, illustrated embodiment of themagnetic recording system of the invention includes a magazine l8,containing the magnetic recording medium and a pair of reelsinterchangeably receiving the medium and which is detachably cooperativewith a translating unit l5. Unit contains driving mechanism and amagnetic translating head cooperable with the recording medium inmagazine Ill.

Unit |'5 also includes suitable electric and electronic circuitcomponents for recording or reproducing as will be understood by thoseskilled in the art. A microphone 28, provided with a switch II, isconnectable to unit l5 through a plug l2 cooperable with the jack |3.- Aloud speaker, or other sound reproducing means, is mounted in unit |5behind a grill l4. A suitable on-oif switch I6 is provided, as well ascontrol knobs generally indicated at H, and indicating lights l8 and 2|.A further control knob 22 is provided for controlling the direction andspeed of movement of the recording medium in magazine III with respectto the translating head in unit l5.

Referring more particularly to Fig. 2, magazine l0 comprises a casing 26having an elongated aperture 21 in its bottom wall. A pair of reels 28and 3| are rotatably mounted in magazine I0 on longitudinally spacedshafts 32, 33 extending transversely of the magazine. The magneticrecording medium 35, which is suitable magnetizable wire, is disposed onreels 28 and 3| and is wound on one reel as it is unwound from the otherreel. In passing between the reels, wire 35 passes under guiding rollers38, 36 freely rotatable on shafts 31, 31 extending transversely ofmagazine I0.

As shown more particularly in Figs. 4 and 5, suitable means are providedfor detachably holding magazine III in aligned relation with translatingunit l5. Such means may comprise latch bars 4|, 4| pivotally mounted onbrackets 42, 42 on the upper wall 43 of unit l5. Wall 43 is providedwith an aperture 44 having substantially the same dimensions and shapeas the bottom wall of magazine Ill whereby the magazine may be insertedthrough the aperture. Springs 45, 45 normally maintain the outer ends oflatch bars 4| in engagement with brackets 46, 46 se- The translatinghead is especured to wall 43. The inner ends of latch bars 4| arebeveled as at 41 for cooperation with similarly bevelled recesses 48, 48pressed into front and rear walls 50, 5| of magazine l0. Magazine I8 ispreferably formed of thin sheet material so that walls 50, 5| may besprung inwardly a small amount.

In operation, as magazine I0 is placed through aperture 44, the innerends of latch bars 4| move downwardly until they engage with bevelledrecesses 48. It will be noted that recesses 48 extend longitudinally asubstantial distance and bars 4| have a length of the same order as thatof the bevelled recesses. Therefore, the latch bars 4|, in cooperationwith bevelled recesses 48, maintain magazine III in the proper positionwith respect to translating unit l5. To release magazine Ill, it isgripped by hand and side walls 50, 5| are pressed inwardly towards eachother, thereby disengaging bevelled recesses 48 from latch bar 4|. Themagazine may then be readily withdrawn from the unit.

An important feature of the present invention is the novel drivingarrangement for the recording medium. The invention driving arrangementtraverses wire or tape 35 at a substantially uniform speed with respectto a suitable slotted magnetic recording head mounted in unit I5. Anadjustable speed drive for this arrangement is shown in Figs. 7 and 8.However, such drive may take one of other well known forms. Theillustrated drive includes a motor 55 having an armature shaft 56 on theend of which is mounted a friction disk 51. The drive shaft 58 isprovided with a key-way 6| that extends traversely of recorder unit l5and has mounted thereon a driven roller 62 having a rim of rubber orother suitable friction material engaging disk 51. The hub 63 of roller62 is provided with a key 64 engaged in key-way 6|, so that drive shaft58 is rotated with roller 62, and the position of roller is adjustablelongitudinally of the shaft for changing the speed ratio of drive ofshaft 58.

Roller 62 is moved longitudinally of drive shaft 58 by a, U-shapedbracket 65 having arms 86, 61 provided with apertures engaging shaft 58and a threaded aperture '88 in its base engaged by a threaded memberIll. Threaded member 10 is adapted for rotation by knob 22 on theforward face of translating unit l5. By suitable rotation of knob 22,roller 62 may be adjusted diametrically of disk 51 to vary the speed ofrotation of the roller 62 or to reverse its direction of rotation in amanner well known to those skilled in the art. Alternatively, a shiftinglever or slide may be used to set bracket 65 and roller 62 for speedcontrol of drive shaft 58. Shaft 58, which is rotated by roller 62operates the novel driving arrangement for reels 28, 3| and recordingwire 35.

Referring more particularly to Fig. 2, the driving arrangement includesa. pair of friction rollers I5, 88 provided with rims 16 of rubber orother suitable friction material. In a manner to be described, rollers15, 80 are urged into continuous frictional engagement with the wire 35coiled on reels 28 and 3|. Friction rollers I5,

I 88 are driven at a uniform angular velocity, and

lower ends of arm 11, 18, respectively, and pins 85, 88, normally urgearms I1, 18 in a direction to move rollers I5, 80 upwardly towardaperture 44. Rollers I5, 80 are-mounted on shafts 81, 88 in the upperend of arms 11, I8 and are preferably secured thereto by suitable meanssuch as welding. brazing and so forth. Also secured to shafts 81, 88 arepulleys 90, 9| provided with bevelled peripheries for engagement byflexiblebelts 02, 93 which are engaged with pulleys 94, 95 (Fig. 7)pinned to rotate with drive shaft 58. By the described arrangement,rotation of drive shaft 58 is smoothly imparted to pulleys 94, 95 andthrough belts 92, 93 to pulleys 90, 9|. Rollers I5, 80 are thereforedriven at equal uniform angular velocities to draw the wire 35 at aconstant rate through recording head 90, and with no drive ripples thatgearing would impart.

It will be noted that roller shafts 81 and 88 are offset outwardly withrespect to vertical lines passing through reel shafts 32, 33, when themagazine I is in position. Therefore, when magazine I0 is inserted intoaperture 44 and rollers I5, 80 engage the wire wound on reels 28. 3I,drive rollers I5, 80 are moved away from each other to exert atensioning effect on record ing medium 35 to take up any slack thereinand maintain the portion of the medium between the reels taut. Suitablemeans such as stop pins 91, 98 are provided to engage arms 11, I8,respectively, to limit movement of rollers I5, 80 toward each other whenmagazine In is disengaged from translating unit I5.

Translating unit I includes magnetic translating head 90, and spoolingmechanism for reciprocating head 60 transversely relative to magazine I0to wind wire 35 in uniform layers on to and off of reels 28, 3|- asshown in Figs. 2 and 3. A pinion I00 is secured for rotation with shaft58 and, through'intermediate gearing IOI, I02, rotates a gear I03secured to a. spooling shaft I04 having oppositely extending helicalrooves I05, I00 in its outer surface. Helical grooves I05, I06 areengaged by a suitable pin I09 in a block I01 mounted on shaft I04 andheld against rotation with respect thereto by a transversely extendingrod II9 (Fig. 2). When shaft I04 is rotated during movement of recordingmedium 35, block I01 will be reciprocated longitudinally of the shaft byalternate engagement of pin I09 with the helical grooves i05, I06.

Block I 0! serves as a support for translating head 60, which is securedthereto by suitable brackets I08, I 08 preferably of non-magneticmaterial such as composition, brass, aluminum, etc. Magnetic recordinghead 50 comprises a magnetic core IIO and a magnetizing coil III. Theupper arms of core III), which is preferably constructed of suitablelaminated ferro-magnetic material are separated a minute distance toprovide a gap 2' in the magnetic circuit across which the wire 35 ispassed and coacts therewith for recording or playback in a manher wellunderstood by those skilled in the art.

Referring to Fig. 3, the upper surface of the inwardly extending arms ofcore H0 is provided with a narrow transverse slot or groove II2 thatreceives wire 35. Upwardly from groove H2, the arms are bevelledoutwardly as indicated at H3 and a pair of trapezoidal members H4, H5

of suitable non-magnetic material such as copper brass, aluminum,plastic, etc., are secured to core I I 0. As will be noted from Fig. 3,a relatively wide angle V-groove is thereby provided leading inwardly tonarrow groove H2. The described arrangement insures proper engagement ofwire 35 with head as magazine I0 is placed into translating unit I5. Thewidth of the upper end of the V-groove head 60 is substantially equal tothe interior width of reels 28, 3|, so as to engage wire 35 irrespectiveof the relative lateral position of the wire on the reels. Upon suchengagement, the wire 35 will be guided into groove II2 as the magazineis pressed into recording position on unit I5. This describedarrangement facilitates proper coaction between magazine I0 andtranslating unit I5 when the magazine is engaged with the unit.

Fig. 6' illustrates an alternative arrangement for mounting drivingrollers 15, 90. As shown, angular arms I1, 18 are replaced by straightarms 11, I8 pivoted on shaft 58. Springs 83', 84 connected to the armsand to a pin H6 urge the arms and rollers I5, for continuous drivingengagement with the wire and reels 28, 3|. This arrangement otherwiseoperates in the same manner as does that illustrated in Fig. 2. Theposition of arms 11', I8 are shown in their uppermost position againststop pins 91, 98. As the magazine containing reels 28, 3| is pressedinto position in unit I5 drive rollers I5, 80, in either embodiment, areautomatically adjusted to maintain driving and frictional engagementwith the peripheral surfaces of the wire 35 on the reels 28, 3I.

Fig. 9 shows a modified form of recording head 60 particularly adaptablefor use with magnetizable tape as the recording medium. As shown, thenarrow groove II2 of head 50 is replaced by a relatively wide slot IIIacross which the tape is guided in a corresponding manner as the wire 35is guided through head 90. In some applications utilizing a magnetictape, there is no need for transverse spooling for layer winding asprovided for the wire.

The described magnetic recording system provides a magazine constructionwhich is greatly simplified over those hitherto used in that it needcontain only the reels and the wire or tape wound thereon. The drivingmechanism for the recording medium, the translating head, the spoolingmechanism therefor, and the electronic components of the system are allcontained within unit I5. Consequently, the cost of magazine I0, as wellas its weight and size, may be greatly reduced.

The driving mechanism provides a simple means for traversing therecording medium at a constantly uniform speed with respect to therecording head. This insures the maximum and uniform recording andplayback quality and response. The drive ratio between the drive rollersand the wire reels are automatically adjusted to provide the constantuniform linear speed of the magnetic wire or tape. Furthermore, by asimple arrangement, the driving mechanism is designed to automaticallytension the recording medium and take up any slack therein uponengagement of the magazine with the translating unit. The recordingwire, also, is automatically engaged by the translating head, which inturn is traversed for layer winding the wire. Simple and easilydisengageable latching means are provided for maintaining the magazinein proper relation with the translating unit when engaged therewith.

While specific embodiments of the invention have been described indetail to illustrate the application of the principles thereof, it willbe understood that the invention may be otherwise 7 embodied withoutdeparting from such principles.

What is claimed is:

1. A magnetic sound translatingunit adapted to cooperatively receive amagazine containing a linear magnetic recording medium coiled on spacedreels, said unit comprising a casing having an aperture in a wallthereof adapted to receive the magazine; frictional drive means forengaging the periphery of the medium as coiled on the reels in saidcasing adjacent the aperture; and driving mechanism in said casing fordriving said frictional drive means at a uniform speed when the magazineis engaged in the aperture to motivate the medium at a constantlyuniform rate irrespective of the diameter of the coils of medium on thereels.

2. A magnetic sound translatingunit adapted to cooperatively receive amagazine containing a linear magnetic recording medium coiled on spacedreels, said unit comprising a casing having an aperture in a wallthereof adapted to receive the magazine; a pair of friction rollersmounted in spaced relation in said casing adjacent the aperture; anddriving mechanism in said casing for rotating said rollers at a uniformangular velocity; said rollers frictionally engaging the recordingmedium coiled on the reels, when the magazine is engaged in theaperture, to draw the medium longitudinally of the magazine at a uniformspeed irrespective of the diameter of the coil of recording medium oneither reel.

3. A magnetic sound translating unit adapted to cooperatively receive amagazine containing a linear magnetic recording medium coiled, on spacedreels, said unit comprising a casing having an aperture in a wallthereof adapted to receive the-magazine; frictional drive means forengaging the periphery of the medium as coiled on the reels in saidcasing adjacent the aperture; driving mechanism in said casing fordriving said frictional drive means at a uniform speed when the magazineis engaged in the aperture to motivate the medium at a constantlyuniform rate irrespective of the diameter of the coils of medium on thereels; and a magnetic translating head engageable with the recordingmedium as it is motivated.

4. A magnetic sound translating unit adapted tive of the diameter of thecoils of medium on the reels; a magnetic translating head engageablewith the recording medium as it is motivated; and spooling meansoperating said head to layer wind the medium as it is traversed acrosssaid head and between said reels.

5. A magnetic recording system comprising, in

combination, a sound translating unit and a magazine disengageablymounted thereon, said magazine containing a linear magnetic recordingmedium and a pair of spaced rotatable reels for interchangeablyreceiving said medium; said sound translating unit containing frictionaldrive means for engaging the periphery of the medium as coiled on thereels, a magnetic translating head arranged to receive said recordingmedium when said magazine is engaged with said unit. and mechanism fordriving said frictional drive means at a uniform speed to motivate themedium at a constantly uniform rate irrespective of the diameter of thecoils of medium on the reels.

6. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageable mounted thereon, saidmagazine containing a linear magnetic recording medium and a pair ofspaced rotatable reels for interchangeably receiving said medium; saidsound translating unit containing frictional drive means for engagingthe periphery of the medium as coiled on the reels, resilient means formaintaining uniform engagement of said frictional drive means againstthe medium on the reels, a magnetic translating head arranged to receivesaid recording medium when said magazine is engaged with said unit, andmechanism for driving said frictional drive means at a uniform speed tomotivate the medium at a constantly uniform rate irrespective of thediameter of the coils of medium on the reels.

7. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageably mounted thereon, saidmagazine containing a linear magnetic recording medium and a'pair ofspaced rotatable reels for interchangeably receiving said medium; saidsound translating unit containing a pair of spaced rotatable drivingelements, mechanism for rotating said elements at a uniform angularvelocity, and a magnetic translating head arranged to receive saidrecording medium when said magazine is engaged with said unit; saidelements frictionally engaging the recording medium coiled on saidreels, when said magazine is engaged with said unit, to draw the mediumlongitudinally at a uniform speed irrespective of the diameter of thecoil of recording medium on either of said reels.

8. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageably mounted thereon, saidmagazine containing a linear magnetic recording medium and a pair ofspaced rotatable reels for interchangeably receiving said medium; saidsound translating unit containing a pair of spaced rotatable drivingelements, mechanism for rotating said'eiements at a uniform angularvelocity and resilient means urging said elements into frictionalperipheral engagement with the recording medium coiled on said reels,when said magazine is engaged with said unit, to draw the mediumlongitudinally at a uniform speed irrespective of the diameter of thecoil of recording medium on either of said reels.

9. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageably mounted thereon, saidmagazine containing a linear magnetic recording medium and a pair ofspaced rotatable reels for interchangeably receiving said medium; saidsound translating unit containing a pair of spaced rotatable drivingelements, mechanism for rotating said elements at a uniform angularvelocity and resilient means urging said elements into frictionalperipheral engagement with the record ing medium-coiled on said reels,when said magazine is engaged with said unit, to draw the mediumlongitudinally at a uniform speed irrespective of the diameter of thecoil'of recording medium on either of said reels; said driving elementsbeing movable away from each other upon engagement with the coiledrecording medium to take up slack in said medium between said reels.

10. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageably mounted thereon, saidmagazine containing a magnetic recording wire and a pair of spacedrotatable reels for interchangeably receiving the wire; said soundtranslating unit-containing a pair of spaced rotatable driving elements,driving mechanism for rotating said elements at a uniform angularvelocity, and a magnetic translating head arranged to receive saidrecording wire when said magazine is engaged with said unit; saidelements frictionally engaging the wire coiled on said reels, when saidmagazine is engaged with said unit, to draw the wire longitudinally at auniform speed irrespective of the diameter of the coil of recording wireon either of said reels; and spooling mechanism operable by said drivingmechanism to reciprocate said head laterally relative to the wire tolayer wind the later onto and off said reels.

11. A magnetic recording system comprising,

in combination, a sound translating unit and amagazine disengageablymounted thereon, said magazine containing a magnetic recording wire anda pair of spaced rotatable reels for interchangeably receiving the wire;said sound translating unit containing a pair of spaced rotatabledriving elements, driving mechanism for rotating said elements at auniform angular velocity, a magnetic .translating head arranged toreceive said recording wire when said magazine is engaged with saidunit, resilient means urging said elements into frictional engagementwith the wire coiled on said reels, when said magazine is engaged withsaid unit, to draw the wire at a uniform speed irrespective of thediameter of the coil of wire on either of said reels, and spoolingmechanism operable by said driving mechanism to reciprocate said headlaterally relative to the wire to layer wind the latter onto and oi!said reels.

12. A magazine adapted to be engageable with a magnetic soundtranslatingunit having friction driving means operable at a substantially v uniformspeed, said magazine comprising, in combination, a casing; and a pair ofspaced rotatable reels for interchangeably receiving said medium; saidcasing being apertured adjacent said reels whereby the driving meanswill engage the recording medium coiled on said reels. when saidmagazine is engaged with the unit, to draw the medium longitudinally ofsaid casing at a uniform speed irrespective of the diameter of the coilof recording medium on either of said reels.

13. A magazine adapted to be engageable with a ma zneticsoundtranslating unit having friction driving means operable at asubstantially uniform speed and a magnetic translating head, saidmagazine comprising, in combination, a casing: a pair of spacedrotatable reels for interchangeably receiving said medium; one wall ofsaid casing being apertured adjacent said reels whereby the drivingmeans will engage the re- 10 cordingmedium coiled on said reels, whensaid magazine is engaged with the unit, to draw the mediumlongitudinally oi. said casing at a uniform speed irrespective of thediameter of the coil of recording medium on either of said reels; and

guiding means adjacent said wall for maintain ing said recording mediumaligned for cooperation with the translating head.

14. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageably mounted thereon, saidmagazine containing a linear magnetic recording medium and spacedrotatable reels for drawing said medium in either directionlongitudinally of said magazine; said sound translating unit comprisinga casing having an aperture in a wall thereof.

for receiving said magazine, and driving mechanism aligned with theaperture; said driving mechanism entering into operative associationwith the recording medium coiled on said reels upon insertion of saidmagazine into the aperture in said casing; and releasable latching meansautomatically operative, upon insertion of said magazine into theaperture in said casing, to retain said magazine in cooperativeengagement with said unit.v

15. A magnetic recording system comprising, in combination, a soundtranslating unit and a magazine disengageably mounted thereon, saidmagazine containing a linear magnetic recording medium, and spacedrotatable reels for drawing said medium in either directionlongitudinally of said magazine; said sound translating unit comprisinga casing having an aperture in a wall thereof for receiving saidmagazine, and driving mechanism aligned with the aperture; said drivingmechanism entering into operative association with the recording medi"mcoiled on said reels upon insertion of said magazine into the aperturein said casing; and releasable latching means automatically operative,upon insertion of said magazine into the aperture in said casing, toretain said magazine in cooperative engagement with said unit; the sidewalls of said magazine having recesses for engageably cooperating withsaid latching means. I

RICHARD A. MARSEN.

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